First time post here just looking for people's opinions. it's my works christmas party in a few night and I'm struggling to settle on an outfit. Past years have been black tie though this year the invite didn't specify a dress code at all, I'm aware some will still be dressing black tie though I've never really been a huge fan so want to do something different which brings me back to my topic title. In your opinions is navy blue with grey chalk stripe too business for a night do? In my mind because it's double breasted it's slightly more formal, therefore acceptable.